The Zaurus Squeak already has the ability to capture images from its camera, but it encapsulates the work within some general primitives.  It would make sense to use those or a similar structure to work across platforms.

Also, TWAIN might be the way to go (http://www.twain.org/).  Not only is the Quickcam VC TWAIN compatable (according to http://www.ctdepot.com/store/cameras/quickcamvc.htm), but so are almost all scanners.  And TWAIN seems to be a cross platform standard, at least with Macs and PCs supported (Linux too?).

Mike

p.s. Ability to capture images in Squeak would be GREAT!  At the Exploritorium in San Francisco I recently saw a number of wonderfully neat interactive image tranformation exhibits.  Squeak would be an awsome base for building this sort of thing!